Re: C Question

[Michal Nazarewicz <mina86@tlen.pl>]

Randi Botse <nightdecoder@gmail.com> writes:

> Hi All,
>
> Im looking at lscpu.c shipped by util-linux-ng-2.17, can you explain
> me how the *vir_types[] declared, is this valid C declaration?
>
> /* virtualization types */
> enum {
> 	VIRT_NONE	= 0,
> 	VIRT_PARA,
> 	VIRT_FULL
> };
> const char *virt_types[] = {
> 	[VIRT_NONE]	= N_("none"),
> 	[VIRT_PARA]	= N_("para"),
> 	[VIRT_FULL]	= N_("full")
> };

As Xiaotian Feng said, N_(x) must be defined somewhere and additionally
to this this definition uses a new syntax where you can specify indexes
of elements you want to set value to, ie. the above is the same as:

const char *virt_types[] = {
	[0]	= N_("none"),
	[1]	= N_("para"),
	[2]	= N_("full")
};

which in turn is the same as:

const char *virt_types[] = {
	N_("none"),
	N_("para"),
	N_("full")
};

The advantage of the new syntax is that you can specify values in any
order and omit some.

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